Nicolas and Olivier, Thanks for your quick reply, it makes sense!
Conglun On Thu, Oct 9, 2008 at 9:43 AM, Olivier Andrieu <[EMAIL PROTECTED]> wrote: > Hi, > > On Thu, Oct 9, 2008 at 06:15, Conglun Yao <[EMAIL PROTECTED]> wrote: >> Sorry, I can't fully understand the source code, but it seems we can >> only define a polymorphic variant with only one additional type >> declaration, like >> `A of int or `A of (int * int) >> rather than `A of int * int > > That's correct. > >> It looks wired, as we can directly define >> type t = [ `A of int * int | `B of string ] in toploop or a *.ml file. > > yes, that's because ocaml handle the "of int * int" a bit differently > in regular and > polymorphic variant declarations: > - in the regular variant the * is a separator between constructor > arguments (thus two arguments) > - polymorphic variants only have one argument, so int * int is > treated as a whole type expression and * is the "tupling" operator > > So yes, this looks wired in the ocaml parser. > > -- > Olivier > _______________________________________________ Caml-list mailing list. Subscription management: http://yquem.inria.fr/cgi-bin/mailman/listinfo/caml-list Archives: http://caml.inria.fr Beginner's list: http://groups.yahoo.com/group/ocaml_beginners Bug reports: http://caml.inria.fr/bin/caml-bugs
